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Rate of ReturnThe annual rate of return is the percentage change in the value of an investment. For example: If you assume you earn a 10% annual rate of return, then you are assuming that the value of your investment will increase by 10% every year. So, if you invest $1,000 for 1 year, then your investment would be worth $1,100 at the end of the one year period, before subtracting expenses.
http://www.sec.gov/investor/tools/mfcc/rate-of-return-help.htm
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